Bring CARP into the tree. CARP = Common Address Redundancy Protocol, which
[dragonfly.git] / sys / net / if_var.h
CommitLineData
984263bc
MD
1/*
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * From: @(#)if.h 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
0d16ba1d 35 * $DragonFly: src/sys/net/if_var.h,v 1.39 2007/08/16 20:03:57 dillon Exp $
984263bc
MD
36 */
37
38#ifndef _NET_IF_VAR_H_
39#define _NET_IF_VAR_H_
40
78195a76
MD
41#ifndef _SYS_SERIALIZE_H_
42#include <sys/serialize.h>
43#endif
1bd40720
MD
44#ifndef _NET_IF_H_
45#include <net/if.h>
46#endif
78195a76 47
984263bc
MD
48/*
49 * Structures defining a network interface, providing a packet
50 * transport mechanism (ala level 0 of the PUP protocols).
51 *
52 * Each interface accepts output datagrams of a specified maximum
53 * length, and provides higher level routines with input datagrams
54 * received from its medium.
55 *
78195a76
MD
56 * Output occurs when the routine if_output is called, with four parameters:
57 * ifp->if_output(ifp, m, dst, rt)
984263bc
MD
58 * Here m is the mbuf chain to be sent and dst is the destination address.
59 * The output routine encapsulates the supplied datagram if necessary,
60 * and then transmits it on its medium.
61 *
62 * On input, each interface unwraps the data received by it, and either
63 * places it on the input queue of a internetwork datagram routine
3013ac0e
JS
64 * and posts the associated software interrupt, or passes the datagram to
65 * the routine if_input. It is called with the mbuf chain as parameter:
78195a76 66 * ifp->if_input(ifp, m)
3013ac0e 67 * The input routine removes the protocol dependent header if necessary.
984263bc
MD
68 *
69 * Routines exist for locating interfaces by their addresses
70 * or for locating a interface on a certain network, as well as more general
71 * routing and gateway routines maintaining information used to locate
72 * interfaces. These routines live in the files if.c and route.c
73 */
74
984263bc
MD
75/*
76 * Forward structure declarations for function prototypes [sic].
77 */
78struct mbuf;
79struct proc;
80struct rtentry;
81struct rt_addrinfo;
82struct socket;
83struct ether_header;
0d16ba1d 84struct carp_if;
bd4539cc 85struct ucred;
78195a76 86struct lwkt_serialize;
984263bc
MD
87
88#include <sys/queue.h> /* get TAILQ macros */
89
4d723e5a
JS
90#include <net/altq/if_altq.h>
91
984263bc 92#ifdef _KERNEL
f2bd8b67 93#include <sys/eventhandler.h>
984263bc
MD
94#include <sys/mbuf.h>
95#include <sys/systm.h> /* XXX */
4986965b 96#include <sys/thread2.h>
984263bc
MD
97#endif /* _KERNEL */
98
1550dfd9
MD
99#define IF_DUNIT_NONE -1
100
984263bc
MD
101TAILQ_HEAD(ifnethead, ifnet); /* we use TAILQs so that the order of */
102TAILQ_HEAD(ifaddrhead, ifaddr); /* instantiation is preserved in the list */
103TAILQ_HEAD(ifprefixhead, ifprefix);
104LIST_HEAD(ifmultihead, ifmultiaddr);
105
106/*
107 * Structure defining a queue for a network interface.
108 */
109struct ifqueue {
110 struct mbuf *ifq_head;
111 struct mbuf *ifq_tail;
112 int ifq_len;
113 int ifq_maxlen;
114 int ifq_drops;
115};
116
2b71c8f1
SZ
117/*
118 * Note of DEVICE_POLLING
119 * 1) Any file(*.c) that depends on DEVICE_POLLING supports in this
120 * file should include opt_polling.h at its beginning.
121 * 2) When struct changes, which are conditioned by DEVICE_POLLING,
122 * are to be introduced, please keep the struct's size and layout
123 * same, no matter whether DEVICE_POLLING is defined or not.
124 * See ifnet.if_poll and ifnet.if_poll_unused for example.
125 */
126
9c095379
MD
127#ifdef DEVICE_POLLING
128enum poll_cmd { POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER,
129 POLL_REGISTER };
130#endif
131
984263bc
MD
132/*
133 * Structure defining a network interface.
134 *
135 * (Would like to call this struct ``if'', but C isn't PL/1.)
136 */
137
138/*
139 * NB: For FreeBSD, it is assumed that each NIC driver's softc starts with
140 * one of these structures, typically held within an arpcom structure.
141 *
142 * struct <foo>_softc {
143 * struct arpcom {
144 * struct ifnet ac_if;
145 * ...
146 * } <arpcom> ;
147 * ...
148 * };
149 *
150 * The assumption is used in a number of places, including many
151 * files in sys/net, device drivers, and sys/dev/mii.c:miibus_attach().
152 *
153 * Unfortunately devices' softc are opaque, so we depend on this layout
154 * to locate the struct ifnet from the softc in the generic code.
155 *
78195a76
MD
156 * MPSAFE NOTES:
157 *
158 * ifnet and its related packet queues are protected by if_serializer.
159 * Callers of if_output, if_ioctl, if_start, if_watchdog, if_init,
160 * if_resolvemulti, and if_poll hold if_serializer. Device drivers usually
161 * use the same serializer for their interrupt but this is not required.
162 * However, the device driver must be holding if_serializer when it
163 * calls if_input. Note that the serializer may be temporarily released
164 * within if_input to avoid a deadlock (e.g. when fast-forwarding or
165 * bridging packets between interfaces).
166 *
167 * If a device driver installs the same serializer for its interrupt
168 * as for ifnet, then the driver only really needs to worry about further
169 * serialization in timeout based entry points. All other entry points
170 * will already be serialized. Older ISA drivers still using the old
171 * interrupt infrastructure will have to obtain and release the serializer
172 * in their interrupt routine themselves.
984263bc
MD
173 */
174struct ifnet {
175 void *if_softc; /* pointer to driver state */
f23061d4 176 TAILQ_ENTRY(ifnet) if_link; /* all struct ifnets are chained */
1550dfd9 177 char if_xname[IFNAMSIZ]; /* external name (name + unit) */
3e4a09e7
MD
178 const char *if_dname; /* driver name */
179 int if_dunit; /* unit or IF_DUNIT_NONE */
984263bc
MD
180 struct ifaddrhead if_addrhead; /* linked list of addresses per if */
181 int if_pcount; /* number of promiscuous listeners */
0d16ba1d 182 struct carp_if *if_carp; /* carp interface structure */
984263bc
MD
183 struct bpf_if *if_bpf; /* packet filter structure */
184 u_short if_index; /* numeric abbreviation for this if */
984263bc 185 short if_timer; /* time 'til if_watchdog called */
3e4a09e7 186 int if_flags; /* up/down, broadcast, etc. */
34b4b6a2
JS
187 int if_capabilities; /* interface capabilities */
188 int if_capenable; /* enabled features */
984263bc
MD
189 void *if_linkmib; /* link-type-specific MIB data */
190 size_t if_linkmiblen; /* length of above data */
191 struct if_data if_data;
192 struct ifmultihead if_multiaddrs; /* multicast addresses configured */
193 int if_amcount; /* number of all-multicast requests */
194/* procedure handles */
195 int (*if_output) /* output routine (enqueue) */
196 (struct ifnet *, struct mbuf *, struct sockaddr *,
197 struct rtentry *);
3013ac0e
JS
198 void (*if_input) /* input routine from hardware driver */
199 (struct ifnet *, struct mbuf *);
984263bc
MD
200 void (*if_start) /* initiate output routine */
201 (struct ifnet *);
984263bc 202 int (*if_ioctl) /* ioctl routine */
bd4539cc 203 (struct ifnet *, u_long, caddr_t, struct ucred *);
984263bc
MD
204 void (*if_watchdog) /* timer routine */
205 (struct ifnet *);
984263bc
MD
206 void (*if_init) /* Init routine */
207 (void *);
208 int (*if_resolvemulti) /* validate/resolve multicast */
209 (struct ifnet *, struct sockaddr **, struct sockaddr *);
9c095379
MD
210#ifdef DEVICE_POLLING
211 void (*if_poll) /* IFF_POLLING support */
212 (struct ifnet *, enum poll_cmd, int);
213#else
214 void (*if_poll_unused)(void); /* placeholder */
215#endif
4d723e5a 216 struct ifaltq if_snd; /* output queue (includes altq) */
984263bc 217 struct ifprefixhead if_prefixhead; /* list of prefixes per if */
c401f0fd 218 const uint8_t *if_broadcastaddr;
db37145f 219 void *if_bridge; /* bridge glue */
698ac46c 220 void *if_afdata[AF_MAX];
141697b6 221 struct ifaddr *if_lladdr;
78195a76
MD
222 struct lwkt_serialize *if_serializer; /* serializer or MP lock */
223 struct lwkt_serialize if_default_serializer; /* if not supplied */
984263bc
MD
224};
225typedef void if_init_f_t (void *);
226
984263bc
MD
227#define if_mtu if_data.ifi_mtu
228#define if_type if_data.ifi_type
229#define if_physical if_data.ifi_physical
230#define if_addrlen if_data.ifi_addrlen
231#define if_hdrlen if_data.ifi_hdrlen
232#define if_metric if_data.ifi_metric
6de83abe 233#define if_link_state if_data.ifi_link_state
984263bc
MD
234#define if_baudrate if_data.ifi_baudrate
235#define if_hwassist if_data.ifi_hwassist
236#define if_ipackets if_data.ifi_ipackets
237#define if_ierrors if_data.ifi_ierrors
238#define if_opackets if_data.ifi_opackets
239#define if_oerrors if_data.ifi_oerrors
240#define if_collisions if_data.ifi_collisions
241#define if_ibytes if_data.ifi_ibytes
242#define if_obytes if_data.ifi_obytes
243#define if_imcasts if_data.ifi_imcasts
244#define if_omcasts if_data.ifi_omcasts
245#define if_iqdrops if_data.ifi_iqdrops
246#define if_noproto if_data.ifi_noproto
247#define if_lastchange if_data.ifi_lastchange
248#define if_recvquota if_data.ifi_recvquota
249#define if_xmitquota if_data.ifi_xmitquota
250#define if_rawoutput(if, m, sa) if_output(if, m, sa, (struct rtentry *)0)
251
252/* for compatibility with other BSDs */
253#define if_addrlist if_addrhead
254#define if_list if_link
255
984263bc
MD
256/*
257 * Output queues (ifp->if_snd) and slow device input queues (*ifp->if_slowq)
258 * are queues of messages stored on ifqueue structures
259 * (defined above). Entries are added to and deleted from these structures
260 * by these macros, which should be called with ipl raised to splimp().
261 */
262#define IF_QFULL(ifq) ((ifq)->ifq_len >= (ifq)->ifq_maxlen)
263#define IF_DROP(ifq) ((ifq)->ifq_drops++)
8e22f1e8 264#define IF_QLEN(ifq) ((ifq)->ifq_len)
fd81ccf9 265#define IF_QEMPTY(ifq) (IF_QLEN(ifq) == 0)
984263bc
MD
266#define IF_ENQUEUE(ifq, m) { \
267 (m)->m_nextpkt = 0; \
268 if ((ifq)->ifq_tail == 0) \
269 (ifq)->ifq_head = m; \
270 else \
271 (ifq)->ifq_tail->m_nextpkt = m; \
272 (ifq)->ifq_tail = m; \
273 (ifq)->ifq_len++; \
274}
275#define IF_PREPEND(ifq, m) { \
276 (m)->m_nextpkt = (ifq)->ifq_head; \
277 if ((ifq)->ifq_tail == 0) \
278 (ifq)->ifq_tail = (m); \
279 (ifq)->ifq_head = (m); \
280 (ifq)->ifq_len++; \
281}
282#define IF_DEQUEUE(ifq, m) { \
283 (m) = (ifq)->ifq_head; \
284 if (m) { \
285 if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) \
286 (ifq)->ifq_tail = 0; \
287 (m)->m_nextpkt = 0; \
288 (ifq)->ifq_len--; \
289 } \
290}
8e22f1e8
JS
291
292#define IF_POLL(ifq, m) ((m) = (ifq)->ifq_head)
293
8bde602d
JH
294#define IF_DRAIN(ifq) do { \
295 struct mbuf *m; \
296 while (1) { \
297 IF_DEQUEUE(ifq, m); \
298 if (m == NULL) \
299 break; \
300 m_freem(m); \
301 } \
302} while (0)
984263bc
MD
303
304#ifdef _KERNEL
305
78195a76
MD
306/*
307 * DEPRECATED - should not be used by any new driver. This code uses the
308 * old queueing interface and if_start ABI and does not use the ifp's
309 * serializer.
310 */
984263bc
MD
311#define IF_HANDOFF(ifq, m, ifp) if_handoff(ifq, m, ifp, 0)
312#define IF_HANDOFF_ADJ(ifq, m, ifp, adj) if_handoff(ifq, m, ifp, adj)
313
314static __inline int
f5703be1
JS
315if_handoff(struct ifqueue *_ifq, struct mbuf *_m, struct ifnet *_ifp,
316 int _adjust)
984263bc 317{
235f6526 318 int _need_if_start = 0;
4986965b
JS
319
320 crit_enter();
321
235f6526
JS
322 if (IF_QFULL(_ifq)) {
323 IF_DROP(_ifq);
4986965b 324 crit_exit();
235f6526 325 m_freem(_m);
984263bc
MD
326 return (0);
327 }
235f6526
JS
328 if (_ifp != NULL) {
329 _ifp->if_obytes += _m->m_pkthdr.len + _adjust;
330 if (_m->m_flags & M_MCAST)
331 _ifp->if_omcasts++;
332 _need_if_start = !(_ifp->if_flags & IFF_OACTIVE);
984263bc 333 }
235f6526 334 IF_ENQUEUE(_ifq, _m);
78195a76 335 if (_need_if_start) {
235f6526 336 (*_ifp->if_start)(_ifp);
78195a76 337 }
4986965b 338 crit_exit();
984263bc
MD
339 return (1);
340}
341
342/*
343 * 72 was chosen below because it is the size of a TCP/IP
344 * header (40) + the minimum mss (32).
345 */
346#define IF_MINMTU 72
347#define IF_MAXMTU 65535
348
349#endif /* _KERNEL */
350
351/*
352 * The ifaddr structure contains information about one address
353 * of an interface. They are maintained by the different address families,
354 * are allocated and attached when an address is set, and are linked
355 * together so all addresses for an interface can be located.
356 */
357struct ifaddr {
358 struct sockaddr *ifa_addr; /* address of interface */
359 struct sockaddr *ifa_dstaddr; /* other end of p-to-p link */
360#define ifa_broadaddr ifa_dstaddr /* broadcast address interface */
361 struct sockaddr *ifa_netmask; /* used to determine subnet */
362 struct if_data if_data; /* not all members are meaningful */
363 struct ifnet *ifa_ifp; /* back-pointer to interface */
364 TAILQ_ENTRY(ifaddr) ifa_link; /* queue macro glue */
365 void (*ifa_rtrequest) /* check or clean routes (+ or -)'d */
366 (int, struct rtentry *, struct rt_addrinfo *);
367 u_short ifa_flags; /* mostly rt_flags for cloning */
368 u_int ifa_refcnt; /* references to this structure */
369 int ifa_metric; /* cost of going out this interface */
370#ifdef notdef
371 struct rtentry *ifa_rt; /* XXXX for ROUTETOIF ????? */
372#endif
373 int (*ifa_claim_addr) /* check if an addr goes to this if */
374 (struct ifaddr *, struct sockaddr *);
375
376};
377#define IFA_ROUTE RTF_UP /* route installed */
378
379/* for compatibility with other BSDs */
380#define ifa_list ifa_link
381
382/*
383 * The prefix structure contains information about one prefix
384 * of an interface. They are maintained by the different address families,
385 * are allocated and attached when an prefix or an address is set,
386 * and are linked together so all prefixes for an interface can be located.
387 */
388struct ifprefix {
389 struct sockaddr *ifpr_prefix; /* prefix of interface */
390 struct ifnet *ifpr_ifp; /* back-pointer to interface */
391 TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
392 u_char ifpr_plen; /* prefix length in bits */
393 u_char ifpr_type; /* protocol dependent prefix type */
394};
395
396/*
397 * Multicast address structure. This is analogous to the ifaddr
398 * structure except that it keeps track of multicast addresses.
399 * Also, the reference count here is a count of requests for this
400 * address, not a count of pointers to this structure.
401 */
402struct ifmultiaddr {
403 LIST_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
f23061d4 404 struct sockaddr *ifma_addr; /* address this membership is for */
984263bc
MD
405 struct sockaddr *ifma_lladdr; /* link-layer translation, if any */
406 struct ifnet *ifma_ifp; /* back-pointer to interface */
407 u_int ifma_refcount; /* reference count */
408 void *ifma_protospec; /* protocol-specific state, if any */
409};
410
411#ifdef _KERNEL
f2bd8b67
JS
412/* interface address change event */
413typedef void (*ifaddr_event_handler_t)(void *, struct ifnet *);
414EVENTHANDLER_DECLARE(ifaddr_event, ifaddr_event_handler_t);
415/* new interface attach event */
416typedef void (*ifnet_attach_event_handler_t)(void *, struct ifnet *);
417EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
418/* interface detach event */
419typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
420EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
421/* interface clone event */
dac161d0 422typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
f2bd8b67
JS
423EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
424
f23061d4 425static __inline void
235f6526 426IFAREF(struct ifaddr *_ifa)
f23061d4 427{
235f6526 428 ++_ifa->ifa_refcnt;
f23061d4
JH
429}
430
431#include <sys/malloc.h>
432
433MALLOC_DECLARE(M_IFADDR);
434MALLOC_DECLARE(M_IFMADDR);
435
436static __inline void
235f6526 437IFAFREE(struct ifaddr *_ifa)
f23061d4 438{
235f6526 439 if (_ifa->ifa_refcnt <= 0)
efda3bd0 440 kfree(_ifa, M_IFADDR);
f23061d4 441 else
235f6526 442 _ifa->ifa_refcnt--;
f23061d4 443}
984263bc
MD
444
445extern struct ifnethead ifnet;
446extern struct ifnet **ifindex2ifnet;
447extern int ifqmaxlen;
448extern struct ifnet loif[];
449extern int if_index;
984263bc 450
78195a76
MD
451void ether_ifattach(struct ifnet *, uint8_t *, struct lwkt_serialize *);
452void ether_ifattach_bpf(struct ifnet *, uint8_t *, u_int, u_int,
453 struct lwkt_serialize *);
0a8b5977 454void ether_ifdetach(struct ifnet *);
984263bc
MD
455void ether_input(struct ifnet *, struct ether_header *, struct mbuf *);
456void ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
984263bc
MD
457int ether_output_frame(struct ifnet *, struct mbuf *);
458int ether_ioctl(struct ifnet *, int, caddr_t);
d6018c31
JS
459uint32_t ether_crc32_le(const uint8_t *, size_t);
460uint32_t ether_crc32_be(const uint8_t *, size_t);
984263bc
MD
461
462int if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
463int if_allmulti(struct ifnet *, int);
78195a76 464void if_attach(struct ifnet *, struct lwkt_serialize *);
984263bc
MD
465int if_delmulti(struct ifnet *, struct sockaddr *);
466void if_detach(struct ifnet *);
467void if_down(struct ifnet *);
6de83abe 468void if_link_state_change(struct ifnet *);
1550dfd9 469void if_initname(struct ifnet *, const char *, int);
e9bd1548 470int if_getanyethermac(uint16_t *, int);
984263bc
MD
471int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
472void if_route(struct ifnet *, int flag, int fam);
473int if_setlladdr(struct ifnet *, const u_char *, int);
474void if_unroute(struct ifnet *, int flag, int fam);
475void if_up(struct ifnet *);
476/*void ifinit(void);*/ /* declared in systm.h for main() */
87de5057 477int ifioctl(struct socket *, u_long, caddr_t, struct ucred *);
984263bc
MD
478int ifpromisc(struct ifnet *, int);
479struct ifnet *ifunit(const char *);
480struct ifnet *if_withname(struct sockaddr *);
481
482struct ifaddr *ifa_ifwithaddr(struct sockaddr *);
483struct ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
484struct ifaddr *ifa_ifwithnet(struct sockaddr *);
485struct ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
486struct ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
984263bc
MD
487
488struct ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
489int if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);
490
491void if_clone_attach(struct if_clone *);
492void if_clone_detach(struct if_clone *);
493
494int if_clone_create(char *, int);
495int if_clone_destroy(const char *);
496
f2682cb9 497#define IF_LLSOCKADDR(ifp) \
141697b6 498 ((struct sockaddr_dl *)(ifp)->if_lladdr->ifa_addr)
f2682cb9 499#define IF_LLADDR(ifp) LLADDR(IF_LLSOCKADDR(ifp))
984263bc
MD
500
501#ifdef DEVICE_POLLING
f5703be1
JS
502typedef void poll_handler_t (struct ifnet *ifp, enum poll_cmd cmd, int count);
503int ether_poll_register(struct ifnet *);
504int ether_poll_deregister(struct ifnet *);
505void emergency_poll_enable(const char *);
984263bc
MD
506#endif /* DEVICE_POLLING */
507#endif /* _KERNEL */
508
509#endif /* !_NET_IF_VAR_H_ */